Make no button fallback to normal suggestions

When the user click on the "No Thanks" button in the fill dialog,
the dialog should be dismissed and then show up IME and inline
suggestions or dropdown UI.

Bug: 234637123
Test: atest android.autofillservice.cts.dialog.LoginActivityTest
Change-Id: I683b8af21b17b10620a34d579e900d4ad76f9785

services/autofill/java/com/android/server/autofill/ui/AutoFillUI.java

@@ -439,6 +439,7 @@ public final class AutoFillUI {
                             log(MetricsEvent.TYPE_DISMISS);
                             hideFillDialogUiThread(callback);
                             callback.requestShowSoftInput(focusedId);
+                            callback.requestFallbackFromFillDialog();
                         }
 
                         @Override